Method of forming a suction cleaning device



Nov. 9, 1937. c. E. STEVENS 2,093,797

METHOD OF FORMING A SUCTION CLEANING DEVICE Filed Dec. 28, 1935 Patented Nov. 9, 1937 UNITED STATES METHOD OF FORMING A SUCTION CLEAN- IN G DEVICE Clarence Everett Stevens, Old Greenwich, Conn., assignor to Electrolux Corporation, Dover, Del., a corporation of Delaware Application December 28, 1935, Serial No. 56,569

3 Claims.

This invention relates to a method of making a nozzle and more particularly a suction cleaner nozzle of the general character shown in Patent No. 1,852,839, granted April 5, 1932 to Engberg et al.

The invention particularly relates to the method 01 making a brush holder nozzle member, of sheet metal or the like, having a reversely drawn angularly disposed central portion for irictionally receiving the end of a rigid pipe connected to suction producing means.

The provision of a suction cleaner nozzle utilizing a brush through which dust and dirt is drawn by means of suction presents certain difllculties in order to provide a device of this character of light weight, of. a construction which does not invite an .accumulation of dust and dirt, and which is not too bulky or too expensive to produce.

Among the objects of this invention is to provide a brush having the characteristics above enumerated and of simple, durable and inexpensive construction.

In accordance with the invention a metallic suction nozzle member is produced by a series of simple metalworking steps. Briefly the method of forming the nozzle membercomprises:

1. Cutting a blank in the form of a circular disk from a. sheet of ductile material:

2. Drawing said disk off center into a cup or cylinder having one end closed and with the side wall tapering off at an angle of substantially 35 or 40 degrees;

3. Pressing in the. bottom of the cup to provide a reversely drawn portion with the wall of the depression formed by the pressed in portion substantially parallel with the wall of the cylinde'r;

4. Increasing the depth of the depression and reducing its diameter;

5. Shaping the device so formed to give it a curved surface and at the same time. slightly increasing the depth 01 the depression;

6. Forming the edge or the device to provide anannular band;

\ 7. Trimming the missed free edge of the band to remove surplus material; I

8. Angularly perforating the bottom of the depression;

9. Rolling or turning the edge or the material forming the opening to give it a flared configuration;

10. Crimping the free edge of the band to provide a constricted opening formed by a brush retaining wall; and lastly,

11. Polishing or applying a surface finish.

Further objects, details, and advantages of my invention will be apparent from the following description of the embodiments thereof shown in the accompanying drawing, wherein:

' Fig. 1 is an elevation of a blank cut from a thin sheet of metal and from which the nozzle member is formed,

Fig. 2, a vertical section of the flange cup member drawn from said blank.

Fig. 3. a vertical section of the next succeeding stamping with its reversely drawn depression.

Fig. 4, a vertical section of the next succeeding stamping with the depression reduced in cross section and deepened.

Fig. 5, a vertical section 01' the next succeeding stamping with the wall of the device around the base of the depression given a curved configuration and with the bottom of the depression similarly but reversely rounded.

Fig. 6, a vertical section of the device of Fig. 5 after its margin has been annularly rolled or formed to provide an annular band.

. Fig. I, a vertical section of the device of Fig. 6 with the surplus portion of the band trimmed oiT,

Fig. 8, a vertical section of the stamping after the next succeeding perforating operation,

Fig. 9, a vertical section of the completely formed device after the final rolling or spinning out of the material about the opening to give it a flared configuration,

Fig. 10, a vertical section of the finished article and its application, and

Fig. 11, a top-plan of the structure of Fig. 10.

In forming the nozzle member a blank Ill, as shown in Fig. 1, is cut from a sheet of metal of the desired thickness but which may be of relatively thin material. The blank I0 is placed "eccentrically between opposed die members, not

shown, and is drawn into cup like formation. The open end of the cup is inclined at an angle from the relatively short cylindrical side wall portion lLto a longer oppositely disposed side wall portion I2. The edge of the side wall portion I! is bent outwardly and forms an extended flange i3. This flange assists in maintaining the blank in proper position relative to the dies during the stamping operation. In the shell or stamping shown in Fig. 2 the metal is drawn in a single direction to form the side walls of the substantially flat bottom II.

The cup-shaped stamping illustrated in Fig. 2 is placed between dies, not shown, and the bottom i4 oi the cup is reversely drawn to provide a substantially shallow inner cup or eepression II, as shown in Fig. 3. This operation shortens the cylindricahside wall of the stamping of Fig. 2 and provides an annular shoulder l6, rounded in cross section, between the outer cylindrical wall portion and the inner cylindrical wall portion II.

The stamping of Fig. 3 is subjected to another drawing operation by means of dies or the like, not shown, which results in the deepening of the depression l5 and a reduction of its diameter, as shown-in Fig. 4, the bottom of the depression remaining flat, and the annular connecting shoulder l6 being broadened or increased in radial dimension.

The next drawing operation imparts a body curvature particularly about the base or the depression, as shown in Fig. 5 and gives the bottom of the depression a curvature it. The stamping thus produced approaches the shape of the finished article except for the rolling'operation of Fig. 6, the trimming operation of Fig. 7, the perforating operation of Fig. 8 and the spinning o eration of Fig. 9.

The stamping of Fig. 5 is rolled, pressed or otherwise worked around its edge to form an article of the configuration oi. Fig. 6, thereby providing an annular band or cylinder ll of substantially uniform width around the free edge portion of the device.

The stamping of Fig. 6 is annularly trimmed to eliminate surplus material and provide a band of the desired width, to receive and retain a brush, as shown in Fig. 'l.

In the next operation, as shown in Fig. 8, the stamping of Fig. 7 has the bottom of its depression I5 cut away at an inclination parallel tothe edge of the band or flange IS. The aperture thus formed provides an opening 20 concentric with flange IS. The cylindrical wall which forms the depression i5 is of the same diameter as the depression of the stampings of Figs. 5, 6, and 7. and forms a sleeve for receiving the rigid extremity of a suction pipe 2|.

As shown in Fig. 9, the wall deflningthe opening 20 of the device of Fig. 8 is spun or otherwise flared outwardly at 22 for cooperative engagement with a resilient nozzle member 23, and flange or band I9 is spun or tapered inwardly so as to form a constricted opening for retaining a brush.

Thus the sheet metal stamping is in its final the nozzle may be mounted upon the rigid end of a pipe connected with suction producing means not shown.

The metal nozzle member may be given any desired surface finish as for example polishing with a nickle or chromium plate or the like.

Within the metal nozzle member is mounted the rubber nozzle member 23 having an inner portion fitting into the flared mouth 22 and' an outer portion overlying the annular flange ll. A brush assembly consisting of bristles 24 clamped over a wire 25 in a split ring forming a retaining strip 28 is mounted within flange I! with a portion of rubber member 23 disposed between the ring and the flange. Split ring 26 may be contracted slightly to pass through the constricted opening formed by flange l9, and when released, expands to clamp itself as well as rubber member 23 securely within the stamping.

If desired, adhesive material may be employed to aid in holding these parts together.

The outer rim 21 of the rubber member serves as a buiferto prevent the device scratching furniture. It also has a downwardly: extending open mouth bell through which suction is adapted to draw dust, et cetera. By this device dust is excluded from the interior of the pressed metal member.

It will be obvious to those skilled in the art that various changes may be made in my method without departing from the spirit of my invention and therefore I do not limit myself to what is shown in the drawing and described in the specification but only as indicated in the appended claims.

I claim:

1. A method of forming a brush having a suction passage through the same which comprises forming a cup from a blank, reversely pressing the. bottom of the cup to provide spaced inner and outer walls with the outer walls formed to receive a brush member and with the inner wall formed to receive a suction pipe and to have applied thereto a member extending downwardly within the confines of said brush member, and cutting out the closed bottom of the inner wall to provide the suction opening passage through the device.

2. A method oi forming a brush having a suction passage through the same which comprises forming a cup from a blank, reversely pressing the bottom of the cup to provide spaced inner and outer walls with the outer walls formed toreceive a brush member and with the inner wall formed to receive a suction pipe and to have appliedthereto a memberextending downwardly withinthe conflnes of said brush member, and cutting the closed bottom of the inner wall and said cup at an angle to provide an angular suction passage through the device.

-3'. In a method of forming a member having a suction passage through the same comprising stamping a circular metallic sheet 011! center into cup shape, whereby the lip of the cup wall is at an angle to the bottom of the cup, reversely stamping the bottom of the cup to form an inner tubular member, and cutting said wall and said member angularly in planes substantially parallel to said lip. I

CLARENCE EVERETT STEVENS. 

